I have just bought a '93 SL500 after dreaming of having one for nearly 15 years. It is metalic blue black with very good bodywork and interior. There is a problem though. The car 'hunts' when it idles and idles at around 500rpm then drops down every five seconds to almost stalling. A couple of times the car has actually stalled when Ive idled forward in traffic. Also the gearchanges are really good most times but every now and then the change is quite hard and feels like the gearbox has mis-timed the change. Where do i start. Someone said the gearbox problem could be connected to the incosistant revves and not holding the vacum pump at thr right pressure?????????